The invention provides a metal zipper polishing device and a method for polishing a metal zipper through utilizing the same. The device comprises a rack and a tank body, wherein the tank body is arranged on the rack. The tank body comprises an electrolytic degreasing cavity, a first rinsing cavity, a weak acid etching cavity, a second rinsing cavity, an electrolytic polishing cavity, a third rinsing cavity, an anti-fading cavity and a fourth rinsing cavity which are sequentially arranged along the length direction of the rack, wherein an ultrasonic device is arranged on the bottom of the electrolytic degreasing cavity; and the metal zipper sequentially penetrates through the electrolytic degreasing cavity, the first rinsing cavity, the weak acid etching cavity, the second rinsing cavity, the electrolytic polishing cavity, the third rinsing cavity, the anti-fading cavity and the fourth rinsing cavity under the action of a zipper guide mechanism and a transmission mechanism, and is led out from a zipper leading-out mechanism to complete a whole polishing process. The device has the beneficial effects that the device is simple in structure, reasonable in design and low in manufacturing cost; moreover, the metal zipper has a good polishing effect, damage to environment and human bodies is effectively reduced, and the metal zipper can be continuously polished.